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Something just hit me I don't know why I didn't mention this before... Are you using the 8.30 drivers or the 8.28 legacy drivers (with the script available at redblog)? Support for the Radeon 9100 was dropped in 8.28.8. If you're using the 8.30.8, try http://www.phoronix.com/redblog/?p=blog&i=NTg1MA (Sorry if you mentioned this before)

I'll see if I can replicate this issue with your configuration using a Radeon 9200. I haven't run into this problem (at least recently that I remember), but I don't deal with R200 stuff too often these days.